Project Hub /Healthcare Biomedical & Assistive/Pulse Oximeter & Vital Scanner/Building Programmable Smart Watch With Fitness Tracking

Intermediate

ESP32

₹1,500 – ₹5,000

6 – 12 Hours

Partial Kit

Building Programmable Smart Watch With Fitness Tracking

A budget-friendly, customizable, and programmable smartwatch built around an ESP12F Wi-Fi chip that tracks location, time, and health metrics like heart rate and SpO2.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

10pcs 5mm RED Diffused Light Emitting Diodes - LEDs Set Rs. 39.00
10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Cable for Arduino Nano (USB 2.0 A to USB 2.0 Mini B) 30cm Rs. 69.00
2-Slot 18650 Holder with Protective Cover and On/Off Switch – Case Rs. 109.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: Battery (generic / unspecified)
LCD (generic / unspecified)
Microcontroller IC (DIP) / Chip
Pulse / Heart Rate Sensor
Capacitors
Enclosure / Box / Case
heart sensor

Browse all components

How It Works

This programmable smart watch is powered by an ESP12F Wi-Fi SoC chip, which acts as the central processing unit and handles wireless connectivity, time synchronization via an NTP client, and overall system logic. User interface and data visualization are handled by a GC9A01 round LCD display driven via the Arduino GFX library. For health tracking, the device integrates a MAX30100 sensor module that uses optical sensing to measure heart rate and blood oxygen saturation (SpO2). Power management is built around the MCP73812T battery charging IC, which safely recharges the internal 3.3V microsize battery through an SMD micro USB female connector. A 2-pin jumper (JP1) and an SMD slide switch (S1) allow for manual power control and circuit isolation. The schematic also includes passive components for proper operation: a 470Ω resistor (R2), a 2kΩ resistor (R3), a 100Ω resistor (R1), an SMD LED for status indication, and 4.7µF SMD capacitors (C1, C2) used for power supply decoupling and stabilization. All of these electronics are housed inside a custom 3D printed watch case body, resulting in a compact, wearable IoT health tracking device.

Why Build This

Develop practical competencies in wearable IoT systems and biomedical sensor integration suitable for undergraduate engineering portfolios.

Implement low-power battery management and wireless connectivity on an ESP12F-based microcontroller architecture.

Design and fabricate custom wearable form factors by combining surface-mount electronics with 3D printed mechanical enclosures.

Real-World Application

Wearable health monitoring, personal fitness tracking, low-cost IoT smart devices, and decentralized health data mesh networks.

Skills You'll Learn

Surface-mount device (SMD) soldering

I2C sensor communication

graphical display programming

power management circuit implementation

wireless time synchronization via NTP

Safety Precautions

Ensure correct polarity when connecting the 3.3V battery to the jumper pins, and handle SMD soldering components with proper care.

Technology Tags

ESP8266

ESP12F

ARDUINO IDE

WI-FI

SMARTWATCH

WEARABLE ELECTRONICS

HEALTH MONITORING

IOT

3D PRINTING

PCB DESIGN

Frequently Asked Questions

Can I program this smartwatch using the standard Arduino IDE?

Yes, the project utilizes the Arduino IDE along with the ESP8266 board support package to compile and upload code to the ESP12F chip.

What specific health metrics can the device track?

The integrated MAX30100 sensor allows the smartwatch to measure heart rate and blood oxygen saturation (SpO2).

How is the internal battery recharged?

The device features an onboard MCP73812T battery charging IC connected to an SMD micro USB female connector, allowing you to safely recharge the 3.3V microsize battery.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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